Paper bags



Dec. 29, 1964 J. J. FEsco 3,163,352

PAPER BAGS Filed May 7, 1962 2 Sheets-Sheet l f90/VCH M TAPE car-arr mp5Z F/6.5 F/a i4 )i F/a? Ej t t INVENTOR. Ja//A/ J /Fffco lli. BY

J. J. FESCO Dec. 29, 1964 PAPER BAGS 2 Sheets-Sheet 2 Filed May 7, 1962United States Patent O 3,163,352 PAPER BAGS Sohn Il. Fesco, Baldwin,FLY., assigner to Stridley Paper Company, Ine., a corporation of NewYork Filed May 7, 1962, Ser. No. 192,731 3 Claims. (Cl. 22962) Thepresent invention relates in general to paper bags and in particular tovacuum cleaner paper bags and a method for forming the same.

Disposable bags of the type which are used as dust collectors in vacuumcleaners or the like u1u-st be relatively inexpensive and yet must beprovided with speciiic structural characteristics so as to be as airpervious as possible and yet be capable of retaining dust particles andother houshold debris picked up by the vacuum cleaner. In addition thebag must be provided with end closure seams which are strong so thatthey will not be opened when subjected to the pressures provided withinconventional vacuum cleaners. Heretofore, in order to provide strong endtype closure seams, the transverse edges of the blank which formed thevacuum cleaner bag were seamed shut by sewing machines or staples andthe seams were then enfolded in adhesive by secured tape webs which weretightly pressed into position over the seams to form the desired strongair-tight end closures. The stitching or stapling operation isparticularly important to prevent the opening or withdrawal of thepleats formed along the side edges of bags of this type. The dualoperations involved in iirst stitching or stapling the end closure seamsand then enfolding themwithin adhesive by secured tapes materially addedto the cost of producing the vacuum cleaner bags.

In view of the foregoing it is an object of the present invention toreduce the cost of manufacturing vacuum cleaner bags which are providedwith pleat securing means and strong airtight end closures.

It is another object of the present invention to obviate the necessityfor stitching or stapling the transverse edges of the vacuum cleanerbags in order to provide strong air-tight end closure seams and toprovide means for retaining the pleated portions of the bags in positionin the region of the end closures.

It is another object of the present invention to provide strongair-tight end closure constructions in a vacuum cleaner bag or the likein which adhesive material securing the tape in 'position isalso'utilized to provide a plurality of rivet-like closures lengthwiseof the transverse edges of the bag, and particularly in the region -ofthe pleated portions.

Other and further objects and advantages of the present invention willbecome readily apparent to one skilled in the art from a considerationof the following specifications taken in connection with the appendeddrawings.

In the drawing which illustrates the best mode presently contemplatedfor carrying out the invention,

FIGURE 1 is a more or less schematic representation of a method forproviding vacuum cleaner bags pursuant to the present invention;

FIGURE 2 is an end view on an enlarged scale of a blank from which thevacuum cleaner bag is formed, the blank being shown in an intermediateexpanded condition thereof for clarity of illustration of the pleatedstructure;

FIGURE 3 is a sectional view on an enlarged scale taken on the line 3-3of FIGURE l;

FIGURE 4 is a fragmentary view of a vacuum cleaner bag partly brokenaway and illustrating the condition thereof during various differentsteps in the manufacture thereof;

FIGURE 5 is a sectional view on an enlarged scale taken on the line 5-5of FIGURE 4;

' I2 `adjacent each of the open endsV thereof.

ice

FIGURE 6 is a sectional view on an enlarged scale taken on the line 6 6of FIGURE 4;

FIGURE 7 is a top plan view of the vacuum cleaner bag pursuant to thepresent invention;

FIGURE 8 illustrates a blank from which the vacuum cleaner bagillustrated in FIGURE 7 is formed, partially expanded for purposes ofmore clearly showing the pleated structure; and

FIGURE 9 is a view similar to FIGURE 1 and illustrates anotherembodiment of the method for forming the vacuum cleaner bags of thepresent invention.

The vacuum cleaner bags 10 illustrated in FIGURE 7 are made by formingan open ended tubular bag blank l2, as best shown in FIGURES 2 and 8,which is provided with a collar 14. The blank 12 is formed with pleats2t) and 22 as a bellows-pinched tube on a conventional bellows-pinchedmachine, the latter being no part of the present invention. The blank 12is provided with opposing upper and lower walls 16 and 13 respectivelywhich are inter-connected by pleated side walls 2li and 22. The upperwall I6 is provided with a central aperture 24 about which the collar 14is suitably secured, as by a suitable adhesive. The blank 12 is open atthe opposite ends thereof and pursuant to the present invention the endsare closed by strong air-tight end closures in a relatively simple andinexpensive manner.

FIGURE l illustrates the method or" providing the blanks 12 with strongair-tight end closures. The blanks 12 are carried or moved in anysuitable manner or by any suitable means in the direction of the -arrowZ6 so as to subject the blanks to the action of a suitable punchingdevice or die 28. The punching die 28, as here shown, is constituted bya die plate 3u which is mounted on a ram or similar member 32 forvertical .reciprocation as indicated by the arrows 34. The die plate 30is provided on its lower surface with two laterally-spaced rows of punchelements 36.

the underlying blank 12, the punch elements 36 will form a series of-holes `or apertures 3S in the underlying blank As best shown in FIGURE2, the holes 3S in the upper wall 16 of the blank 12 will be in registrywith similar holes defined in the underlying Wall I8. It should be notedthat the blank shown in FIGURE 2 has been somewhat expanded to moreclearly show the pleats and that as said blank is processed the pleatsand upper and lower Wall are all in surface contact with each other.Moreover,

the end holes 38A in each line of holes or apertures formed in both theupper and lower walls of the blank will extend through the individualpleats 4d defined in each of the side walls 2d and 22 of the blank, itbeing noted that the end holes 38A in the upper and lower walls are inregistry with the holes dened in the pleats 4?.

The blanks 12 provided iwith the holes or apertures 3S are carried to asucceeding position at which a suitable 'adhesive is applied thereto.best shown in FIGURE l, provision is made for a pau' of adhesiveapplicators 42 which are disposed so as to apply a strip 44 of asuitable adhesive both to the upper wall 16 and the lower wall I8 ofeach blank 12 along each row of apertures 38 defined therein. Theadhesive is advantageously of the hot melt type and the applicatorsinclude suitable heating mean-s. As best shown in FIG- URE 4, it will beunderstood that each stripe 44 of adhesive extends along and inwardly ofthe adjacent marginal edge 46 of each of the upper and lower walls ofthe blank 12 so ras to permit for the adhesive to flow into theapertures or the holes 3S and also to deline an adhesive band whichextends transversely of the blank l2 at each marginal end thereof so asin eiect to provide for the formation of four stripes of adhesive 44there being two It will be understood that when the oper-v ating oractuating rain 32 moves the die plate 30 towardV More specifically, andas.

stripes of adhesive on the upper Wall 16 and two stripes of adhesive onthe lower wall 1S each stripe extending along the adjacent marginal edge46 of the associated wall. It is preferred that the adhesive span thehole and coalesce with the adhesive supplied from the opposing side ofthe blank. The blanks 12 are then passed through a pair of opposing tapefolding devices 43 as best shown in FIGURE 3.` In each .folding device48 the open end of each blank is enfolded in a tape Vweb Stiwhichpcornes Vofi or extends from a tape supply roll 52.. Suitableguides 54 are provided for properly feeding the tape from the roll 52 tothe associated folder 48. As best seen in FIG- URE 4, it will be notedthat theV folded tape 50 completely enfolds each end of the blank 12 andoverlies the adjacent adhesive stripe 44 on each surface of the adjacentportion of the opposite walls of the blank. As each blank leaves theassoci-ated or companion folders 48, the tape is cut between the blankwhich has just received thetape and the next succeeding blank so as toprovide for the separation of successive blanks. It will be understoodthat any suitable means may be provided for this purpose. The blarltsthen pass through pairs of compression rollers S6 it being noted thatthe tape along each transverse marginal edge of the blank is subjectedto the action of oneY pair of the compression'rollers as best shown inFiG- URE 1. The compression rollers force the tape against theunderlying adhesive stripe so as to provide for a good desired bondingaction between the tape and the adhesive stripe. Moreover, the rollersforce the tape into the apertures 38 as best shown in FIGURES 5 and 6.FIGURE 6k is a section taken through the end holes 33A in each of a pairof opposing rows of holes 3S, the end holes 38A being in registry withholes 38B which have been formed in the pleats 40 as best shown inFIGURE 2. It will be noted from FIGURE 6 that the action of the rollers56 is to force the adhesive V44 from the outer surfaces of the opposingwalls 16 and 17 into theholes 38A and the intermediate holes 38B andalso to force the overlying portions of tape Si) into the holes so as toeffectively provide a bond or'rivet 58 `formed by the opposing portions50A of the tape 56 and the intermediate adhesive 44. This ltape adhesiverivet has the highly desirable eiiect of preventing the pleats 449 frombeing pulled out or being expanded from between the upper and lowerwalls 16 and 1S at the ends of such walls yor at the four corners of theresulting bag 10. A similar tape adhesive rivet 60 is formed at eachpair of opposing holes 3S inwardly of the end hole 38A as best shown inFIGURE 5. Consequently, it will be apparent that each of the originallyopened ends of each blank 12 is now provided with a strong air-tight endclosure 62 which is formed by a series of taped adhesive rivets whichextend transversely of eachvof the original end openings and by theadhesive stripes 44 along each surfacek of theupper and lower walls atthe Vadjacent marginal ends thereof enclosed by the folded tape web 50.Consequently, it will -be apparent that there has -been provided an endclosure 62 which is highly eliicient and relatively inexpensive andwhich obviates the previously required necessity for wire stapling orproviding a stitched seam at each open end of the l.blank 12 as requiredin the prior art.

It is within the scope of the present invention to provide the endclosures 62 by utilizing a tape web which itself is provided with asuitable adhesive rather than by providing for a stripe 44 of adhesiveon each outer surface of the upper and lower walls adjacent the openends of the blank 12 as previously described. More specifically and asbest shown in FIGURE 9, after each blank 12 is provided with the rows ofapertures 38 provided therein in the previously described manner, theblanks are passed through the tape folders 48 as previously described,the blanks traveling in a direction of the arrow 25. However, in thepresent embodiment, provision is made for a tape web 64 which is coatedon one surface thereof with `a suitable water or heat activated adhesive66. The tape web 64 is enfolded about the adjacent open end of the blank12 in the same manner as previously described so as to engage theadhesive coating 66 thereof with the blank. rThereafter the tape 64 iscut from the blank, as previously described and the blank is thensubjected to the action of the pressure rollers 56 as previouslydescribed. These pressure rollers force the tacky adhesive coating 66into the lholes 38, 38A`and 4t) in the same manner as previouslydescribed to form the taped adhesive rivets 58 and 6? to produce thevacuum cleaner bag 10 provided with the end closures 62 as previouslydescribed. It .will be understood that in all respects the end closure62. provided by the process illustrated in FIGURE 9 isV the same as theend closure 62 provided by the process illustrated in FlGURE 1.

While I have described the presented preferred embodiments of theinvention, it will be understood that various changes and modificationsmay be made therein K without however departing from the spirit andscope of the present invention as defined in the appended claims.

I claim: 1. A bag having opposing upper and lower walls and pleated sideWalls extending therebetween to define a bellows tube, apertures beingdefined in said tu-be at at least one end thereof,V a coating formed ofadhesive material t provided at the outer surface of each of said upperand lower walls at said end of said tube, said coatings extending intosaid apertures so as to fill said apertures with coalesced adhesivematerial, and a tape folded over said end of said tube and securedthereto by said coatings, said tape extending Yinto said apertures from-both said upper and lower walls and being secured together in spacedrelation in said apertures by the adhesive material filling saidapertures and interposed between the opposing portions of said 'tapewhich extend into said apertures and means provided for access into theinterior of said bag. 2. A bag as in claim 1, said adhesive materialbeing of the hot melt type. l

3. A bag as in'claim 1, said adhesive material being formed as a coatingon one surface of said tape.

References Cited in the file of this patent UNITED STATES PATENTS2,542,245 Gottesman Feb.-20, 1951 2,660,100 Dayle Nov. 24, 19532,865,556 Williams Dec. 23, 1958 2,899,347 Kindseth Aug. 11, 19592,955,517 Honsel Oct. 11, 1960 2,968,432 Craighead Jan. 17, 19613,029,012 Leslie Apr. 10, 1962 3,038,651 Cloudsley June 12, 1962

1. A BAG HAVING OPPOSING UPPER AND LOWER WALLS AND PLEATED SIDE WALLSEXTENDING THEREBETWEEN TO DEFINE A BELLOWS TUBE, APERTURES BEING DEFINEDIN SAID TUBE AT LEAST ONE END THEREOF, A COATING FORMED OF ADHESIVEMATERIAL PROVIDED AT THE OUTER SURFACE OF EACH OF SAID UPPER AND LOWERWALLS AT SAID END OF SAID TUBE, SAID COATINGS EXTENDING INTO SAIDAPERTURES SO AS TO FILL SAID APERTURES WITH COALESCED ADHESIVE MATERIAL,AND A TAPE FOLDED OVER SAID END OF SAID TUBE AND SECURED THERETO BY SAIDCOATINGS, SAID TAPE EXTENDING INTO SAID APERTURES FROM BOTH SAID UPPERAND LOWER WALLS AND BEING SECURED TOGETHER IN SPACED RELATION IN SAIDAPERTURES BY THE ADHESIVE MATERIAL FILLING SAID APERTURES AND INTERPOSEDBETWEEN THE OPPOSING PORTIONS OF SAID TAPE WHICH EXTEND INTO SAIDAPERTURES AND MEANS PROVIDED FOR ACCESS INTO THE INTERIOR OF SAID BAG.